How do I unmount a bound /proc in a “dead” chroot?Thanks. Yes, <chroot>/proc and, by extension, <chroot> still exist. And actually, I did try to unmount <chroot>/proc. For instance: _@_:~$ sudo umount -n <chroot>/proc/ [sudo] password for _: umount: <chroot>/proc: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) And then, the only process that lsof comes up with is lsof itself: _@_:~$ lsof <chroot>/proc/ COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME lsof 7046 _ 3r DIR 0,3 0 1 <chroot>/proc/ Thanks again.